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7\left(2x+4\right)=10\left(49-14x\right)
Multiply both sides of the equation by 35, the least common multiple of 5,7.
14x+28=10\left(49-14x\right)
Use the distributive property to multiply 7 by 2x+4.
14x+28=490-140x
Use the distributive property to multiply 10 by 49-14x.
14x+28+140x=490
Add 140x to both sides.
154x+28=490
Combine 14x and 140x to get 154x.
154x=490-28
Subtract 28 from both sides.
154x=462
Subtract 28 from 490 to get 462.
x=\frac{462}{154}
Divide both sides by 154.
x=3
Divide 462 by 154 to get 3.